Exposing your brain to novel learning challenges, such as learning a new language, can help with neuroplasticity and benefit brain health in general. The same can be said for learning how to play and instrument or taking on different mathematical tasks, which can challenge and mature the brain on multiple levels.
Although it is a purely mythical creature, the unicorn has been used as a symbol of religious skepticism: The Church of the Invisible Pink Unicorn is one of the most popular parody religions, next to the Church of the Flying Spaghetti Monster.
The number 7 occurs frequently in human culture - seven deadly sins, seven wonders of the world, even seven dwarves! The number also influences authors, with seven being a popular choice for fantasy series such as ‘The Chronicles of Narnia’.